本研究探討混料式射出成形螺桿對聚乳酸(Polylactic Acid, PLA)和聚乳酸添加有機蒙脫土(Organic Montmorillonite, OMMT)複合材料的機械性質影響，以直接射出製程對複合材料進行混料成形；利用氨基矽烷偶合劑(Amino-Silane coupling agent)進行有機蒙脫土二次改質，探討聚乳酸添加商用有機蒙脫土(PLA/M)及二次改質蒙脫土之複合材料(PLA/S/M)性質差異性。利用混料式螺桿進行不同蒙脫土比例之複合材料成形，探討雙螺桿押出造粒後由單節距螺桿射出成形試片及直接以混料式螺桿射出成形試片分子結構與機械強度差異性。研究方法首先利用以Flow2000與ANSYS-CFD模組對設計之混料特徵進行流場與混料能力驗證並製造。以實驗設計與迴歸分析方法找出射出成形複材拉伸強度與衝擊強度影響最大之製程參數，並探討兩種製程方法成型試片之機械性質差異性。由實驗結果PLA添加3wt%之商用有機蒙脫土(Cloisite 25A)有較佳機械性質，影響複合材料機械性質為最大因子為料溫；高料溫成形時，混料式螺桿試片抗拉強度與耐衝擊強度相較單節距螺桿試片下降約0.9~12.7%；低料溫進行PLA添加二次改質蒙脫土之成形時，相較於單節距螺桿試片，混料式螺桿試片機械性質上升約7.0~70.6%。本研究之混料式射出形螺桿對PLA添加有機蒙脫土複材研究成果可應用於食品用具與醫用輔具一次性複合材料混料與射出成形。

This study is devoted to design a new type of mixing screw in injection molding to investigate mechanical properties influence of polymer composites by injection molding process. Polylactic Acid (PLA) and PLA composites with Organic Montmorillonite (PLA/M) have been selected to be investigated by regular and mixing screw performed by injection molding. Relation between tensile strength, impact strength, hardness of PLA and PLA/M composites have been tested and discussed. The amino silane coupling agent is selected as interface improving agent of PLA and Organic Montmorillonite (PLA/S/M). Design of injection molding experiment is adopted to find the most significant factor for tensile strength and impact strength of composites sample. Design of such mixing screw has been Flow2000 / ANSYS-CFD simulation for mixing characteristics. Results of shear rate and flow velocity simulation with three feature designs of mixing characteristics. For the best to be fabricated. From experimental results, the better mechanical properties of PLA composites have been obtained by the PLA composites of PLA/M3.0 group. The regression analysis has been used to find the significant factor as melt temperature of injection molding parameter. The processing with low level melt temperature can achieve better mechanical results. With such two types of screw tests, the mechanical properties of PLA composite including tensile strength and impact strength by mixing screw are 0.9~12.7% lower than that of regular screw. Furthermore, process in low level melt temperature, the mechanical properties of tensile strength and impact strength of PLA/S/M composites by mixing screw are higher 7.0~70.6% than those of the single pitch screw. Result of this study can be futher applied on food tableware or medical aids in the one-time molding process in future.

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